cURL to Go, Rust, PHP, Ruby, C# & Java

API documentation tends to show curl and maybe one or two popular languages. If your backend is written in Go, Rust, PHP, Ruby, C# or Java, you have to translate the example yourself, looking up how each client library sets methods, headers and bodies. This converter reads the curl command and writes code that uses each language’s standard or most widely used HTTP client.

The clients chosen

Go gets net/http from the standard library. Rust gets reqwest, the de facto HTTP client, in its blocking form so the example runs from main without an async runtime; the comment at the top gives the Cargo line. PHP uses the cURL extension, available on almost every host. Ruby uses Net::HTTP from the standard library. C# uses HttpClient with an HttpRequestMessage, and Java uses java.net.http.HttpClient, built into Java 11 and later. None of them needs a third-party package except reqwest.

How the parts are translated

The method and URL come first: http.NewRequest("POST", url, body) in Go, Net::HTTP::Post.new(uri) in Ruby, new HttpRequestMessage(new HttpMethod("POST"), url) in C#. Every -H header becomes a header call in the language’s style. A request body from -d, --data-raw or --json becomes a string body. Credentials from -u user:password become an Authorization: Basic header, which works identically in every language. -L turns on redirect following where the client does not do it by default (PHP and Java), and -k turns off certificate verification explicitly, with a visible option name so it is easy to find and remove.

What you may need to finish

Multipart uploads from -F need each language’s multipart builder; PHP gets CURLFile objects directly, while the Go output marks the spot. The Rust code is blocking: in an async service use reqwest::Client and add .await to send() and text(). The C# code uses top-level await, which works in .NET 6 console apps; in other contexts wrap it in an async method.

A worked example

The sample order request becomes, in Go, req, err := http.NewRequest("POST", "https://api.example.com/v1/orders?notify=true", body) followed by req.Header.Set("Authorization", "Bearer sk_test_123") and the other headers. In PHP it starts with $ch = curl_init("https://api.example.com/v1/orders?notify=true"); and sets the JSON body with CURLOPT_POSTFIELDS. In Java the body is passed with HttpRequest.BodyPublishers.ofString(…).

Making it production-ready

Snippets show the request, not the surrounding engineering. Add timeouts, reuse clients rather than creating one per call, read secrets from configuration instead of literals, check status codes before parsing the body, and decode JSON into typed models rather than printing the text.

Keeping secrets out

The conversion runs only in your browser, but tokens in the command are copied into the code. Replace them with environment variables before committing: os.Getenv("API_TOKEN") in Go, getenv('API_TOKEN') in PHP, ENV['API_TOKEN'] in Ruby, Environment.GetEnvironmentVariable in C#, System.getenv in Java.

Checking the translation

The panel under the output summarises what the command does: method, URL, header names, body size and options such as basic auth or redirects. Compare it with the API documentation before trusting the code; if a header is missing there, it was not in the command either. Warnings name any curl option that has no equivalent in the generated code, such as a proxy or a client certificate.

Reading the response

Every snippet prints the status code and the response body as text, so you can run it and see what comes back. Once that works, replace the printing with parsing into typed models and handle error statuses explicitly.

Related tools

Generate JavaScript or Python with cURL to Fetch, create response models with JSON to Go, JSON to Rust or JSON to C#.